Collapsible and portable core form



sept.l 1s, 1592s. 1,685,012

H. J. YAGER Y COLLAPSIBLE AND PORTABLE- CORE FORM original Filed April 29, 1926 2 Sheets-sheet 1 v Sept. 18, 1928.

v'H. J. YAGER,

COLLAPSIBLE AND lPQRIIABLEI CORE FORM 2 Sheets-Sheet 2 Original Filed April 29, v19263 Patented Sept. 18, 1928.

Lessen UNITED sTArss PATENT OFFICE.

HARVEY J. Yesss, or SEATTLE, WASHINGTON.

' coLLArsIBtn AND PORTABLE conn FORM.

Application led April 29, 1926, Serial No 105,431.` Renewed `February 23, 1928.

Thisinvention relates to collapsible and portable core forms fory molds ofthat type used in building concrete chimneys, elevator shafts and other rhollonr structures, and

morev particularly to improvements in the collapsible and portable core form forming the subject-matter of my application filed August 1, 1925 serially numbered 47,603

'Whichbec'ame Patent Number 1,591,907 on March 12, 1926.

The presentinvention has for one of its objects the provision' of novel and highly efiicient means for holding the sides ofthe core-forni against outward displacement While the core form is being assembled and the concrete' poured. ,y

A further object of the present invention is tol improve the' Wale pieces and wedges 'of the core form tothe end that the core foi-nr ivi-libe held against collapsing under any pressure that the material of which it is made Will resist Without racturing;

A further object ofthe present invention is to alter the formation of the mold blocks to the end that they may be more readily Withdrawn from thestructure being molded.

Vitli the foregoingand other objects in view, the nature of which Will'4 become apvparent as the description proceeds, the present` invention consists of the novel construe# tion, combinationandarrangementqof parts hereinafter fully described 'and claimed, and f.

illustrated in the accompanying drawings, wherein: Y g

Figure- 1 is a sectional view taken on Va plane 'extending verically through the core form and a finished section of a chimney or elevator shaft, the core form beingfshovvn i vin* position to permit the 'building` of another section of the chimney or elevator shaft, f 1

Figure 2 is a sectional View taken on a plane extendingv horizontallythrough the core form, chimney or elevator shaft and ontsideform,

Figure 3 is a detail top plan view ofthe frame ormeansfor holding the sidesof the core form against outward displacement nWhile assemblingthe parts of the core forni and pouring,` the concrete,

Figure'e is a detail sectionalA View taken on thevertical plane indicated by the line {i4-4 ofFigure 1, v

Figure l5'is a' similar view takenonI the vertical plane indicatedby the line 5+5o`f F 15g-ure 1, and

Figurey 6 is a detail View yin elevationfof -one of they mold 'blocks of thecoi'e form.

The core form comprises opposite sides l .i and Il and opposite sides 5 vand 5, the latter being' located between thel former.- Diagonally opposite corners of the core ,form are beveled as indicated at ,6, and positioned at and contacting with'these corners are removable strips 7 Which correspond inlength to the corresponding dimension; of the' core form and are `of right angled triangular 'for-` mation in horizontal section. l/Vale pieces 8 aresecured Ato the sides 4f and 4, and Wale pieces 9 to the sides 5 and 5x. `The Wale: pie'cesS terminate short ofthe vertical edges of the sidesl and l iemand-the ends thereofare inclined with respect tothe vertical. The,

'Wale pieces 9 vextend to:` the vertical edgesfof lthe sides and- 5, andare provided at their ends with recesses` 10 for the reception of the' ends of the Wale pieces 8; The recesses 10 present each Wale piece 9 with shoulders 105i andzlOb and extensions 10c of which the lat; ter have vertical inner sides. The shoulders 10a are vertical and contact Vwiththe Wale Apieces 8,' and the' shoulders 10? are inclined with respect tothe vertical and spaced from these Wale pieces. At diagonally opposite corners of the core form, the shoulders 10 of the Wale pieces ,9 contact with the Wale pieces y8, and at these points Wedges 11 are positioned between the ends of the Wale pieces 8 and the extensions v10C of the Wale pieces 9. At' the other diagonally opposite corners-of the core form, Wedges 12 are positioned between' the Wale piecesA 8 and the shoulders 10b of the Wale pieces 9 and Wedges 13' are positioned between the ends of the Wale pieces 8 andthe extensions l0c of the Wale pieces 9. "Ehe shoulders" lObnof the low erm'cst Wale pieces 9 and the ends of the loiverniost Wale pieces Sinclinedownwardly andvoutivaidly so as topermit'the Wedges `between these parts Vto be displaced in a downward direction, these Wedges being secured against casual displacement by; 'nails Y 14. In the lower portion of the core form there is'comparatively little room in Which to Work, and the arrangement ofthe lowermost wedges permits themI to be easily and quickly displaced when it is desired to take "the core form apart after completing a section of the structure beine'V molded. The arrangement of the ends oi3 the Wale pieces 8 and 9 in overlapping relation together With the wedgesfll, 12 andi13 render it impossible forthepressure exerted on the core form' by lthe concrete to move the sides-4 6El out' of alinemcnt at the corners thereof.

To hold the sides 4--52 of the core form Y againstioutward displacement While assemi secured to the upper sides of the bars 23 so as to effect the supporting'lof the scaffold` planks 20 in the same horizontal plane.`

bling the core orm'and' pouring the :con-

crete, there is provided a frame 15 the sides Ofwhich are of angular form in cross scction. The frame 15 is adapted to be applied toftheupperend of the core form With the horizontal members of its sides in contact with the upper edge of the core `form and with the vertical members of its sides in con-V Y tact with the outer surfaces of the core orm The ramemay be made of wood or metal.

and the sides thereof are connected by :ingu- V `lar corner pieces 16. The frame isadapted to be secured against casual displacement by nails 17 or the like. The core form is connected to the outside ormby bolts 18 and wire loops 19. i Y i The core form is supported by scaifold planks 20Which are in turn supported by trusses 21. Each truss comprises an upper bar-22 and alower bar `23 which contact with veach other and an end of each of which ex'- tcnds beyond an end ofthe other. The bars 22 and 23 are connected together by a hinge ,24 which comprises a plate 25 bolted to the under side ol the bar 23 and provided With a barrel 2G, and a plate 27 bolted to the upper side of the bar 22 and provided with a loop 28V which jembraces this bar and passes through the barrel 26. Filler blocks 29 are Yokes 3,0 straddle the bars 22 and 23, and are pivoted to the edges of tliebars 22 as at 3l.` Pins 32 are removably carried by the yokes 30 and contact with the lower sides of the bars 23. The yokes 30 and pins 32 prevent the bars 22. and 23 from having any casual pivotal movement.V To prevent their loss` the pins 32 are connected. to the yokes 30 by iiexible elements 33, and to limit the pivotalA movement of the bars 22 and 23 of each truss in a direction awayfrom each other, a flexible element 34 is connected to the bars.

The core form is adapted tobe used for building an entire chimney, elevator `shaft or other hollow structure. After a' section ofthe structure is completed, the outside form and core form' are taken apart and removed and again erectedk and supported in an upwardly extending position With relation to the completed section, as clearly illustrated in Fi ure 1..,lnthis ligure and in Figure 2, 35 esignates the partly completed structure. Opposite sides of the core form are provided with mold blocks 36 which areV adapted to form' recesses 37 `iniinner opposite sides of the structure 35. The upper, lowery and lateral edges of the moldblocks 36are beveled in orderto permit them to be 1 readily `withdrawn from the concrete. -The i recesses 37. are adapted for the reception of the ends of the trussbars 22 and 23,'and to .preif'entithe bottom walls ofthe recesses 37 from breaking down under the Weight placed thereon, reeni'orcing rods 38are embedded i in the structure 35 directly belowV said Walls.`

To permit the scali'old timbers 2O and Vtrusses 21 to be removedfromj the completed section of the structure 35 after the removal ol the core form, cables 39 are provided and i are connected to the scaoldtimbers 20 and yokes. 30. H e

From the foreofoing description, taken in? "connection with the accompanying drawings,

it will be understood that` the core form may device which I now consider to be the best 1Y0 5 embodiment thereof, I desire to `have Vit understood that the device shown is merely illustrative, andthat such changes may be made When desired yas are Within the scope ofthe invention as clalmed. l

IfVhat is claimed is Y 1. A core .form comprising separable sides,

Wale piecescarried by certainof said sides,

other Wale pieces carried bythe other sides and having recesses for the reception vof the ends of the first' namedwale pieces, 1 and the Wale pieces.

Y `Wedges positioned between certain ends of"- 2. A core `form comprising separable sides,V i

Wale piecessecuredto certain ofsaid sides' and having their ends inclined with respect vto the vertical, other Wale pieces secured to the other sides and having certain of their ends contacting With` the first named Wale pieces and provided 'with extensions, the

`other ends oi said other Wale pieces having extensions and inclined with respect Ato' the horizontal, wedges positioned between the ends 'of the `first named Wale pieces and thei extensions of the other Wale ieces,iand

wedges positioned between theA rsty named 1anV 'Wale pieces and the inclined ends of the other Wale pieces.

3. A core form comprising separable sides, wale pieces secured to certain of said sides and terminating short of the Vertical edges thereof, other Wale pieces secured to the other sides and having recesses for the reception of the ends of the irst named Wale pieces, and Wedges positioned Abetween the Wale pieces.

4. A Core form supporting truss comprising' pivotally connected bars, a yoke carried by one of the bars and embracing the other,

and a pin removably carried by the yoke and contacting' With the other bar.

5. A core form supporting truss comprising upper and lower bars, a hinge connecting an end of one of the bars to the other', a yoke pivotally connected to one of the bars and embracing the other, and a pin removably carried by the yoke and contacting With the otherbar.

In testimony whereof I affix my signature.

HARVEY J. YAGER. 

